Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

doi:10.1088/1674-1056/25/1/016102

Abstract The investigations of the crystal and magnetic structures of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range (from 4.2 K to 150 K). It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.

Keywords: barium hexaferrites neutron diffraction crystal and magnetic structures

Received: 31 July 2015
Revised: 15 September 2015
Accepted manuscript online:

PACS:	61.05.fm	(Neutron diffraction)
	61.50.Nw	(Crystal stoichiometry)
	75.10.-b	(General theory and models of magnetic ordering)

Fund: Project supported by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (Grant No. K4-2015-040). L. Panina acknowledges support under the Russian Federation State contract for organizing a scientific work.

Corresponding Authors: Alex Trukhanov
E-mail: truhanov86@mail.ru

Cite this article:

Alex Trukhanov, Larisa Panina, Sergei Trukhanov, Vitalii Turchenko, Mohamed Salem Evolution of structure and physical properties in Al-substituted Ba-hexaferrites 2016 Chin. Phys. B 25 016102

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